Communications: radio wave antennas – Antennas – Body-attached or connected
Reexamination Certificate
2001-05-24
2003-03-11
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
Body-attached or connected
C343S7000MS, C343S702000
Reexamination Certificate
active
06531988
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an antenna device used in high-frequency radio apparatuses and a compact-size high-frequency radio apparatus which uses the antenna device, and in particular, to a very compact-size high-frequency radio apparatus such as a watch-shaped high-frequency radio apparatus and an antenna device used in high-frequency radio apparatuses.
Conventionally, a helical dipole antenna is generally used as an antenna for portable devices such as cellular phones which belongs to high-frequency radio apparatuses.
The helical dipole antenna is configured in a manner that it is drawn out from or kept contained into the case of a portable device when used.
Furthermore, as disclosed in Japanese Patent Laid-Open Publication No.3-175826, there is also known another configuration in which another type of antenna is disposed within the case of a portable device so as to form a diversity together with a helical dipole antenna. As such an antenna for high-frequency radio apparatuses, which is incorporated within the case, an inverted-F antenna has been used.
A thin card type portable apparatus for 2.4[GHz] band employs a chip antenna using ceramic material.
However, the above-stated helical dipole is still large to apparatuses such as watch-size portable apparatuses which are demanded to be more compact. It is difficult to simply incorporate the helical dipole antenna into the apparatus case.
The degree of freedom for arrangement is low in the inverted-F antenna, since both its antenna element and its ground plate (main plate) are formed as an integral unit. As a result, the inverted-F antenna is difficult to be made compact any more.
On the other hand, in the case of the ceramic chip antenna, although the chip antenna itself can be surface-mounted, an antenna including its peripheral circuit is still large as a part. In addition, the chip antenna is fairly high in cost.
An object of the present invention is therefore to provide an antenna device for a high-frequency radio apparatus, a high-frequency radio apparatus, and a watch-shaped radio apparatus, which can be made more compact, increase sensitivity of the apparatus, and be prevented from being damaged by static electricity.
DISCLOSURE OF THE INVENTION
According to one aspect of the invention, an antenna device for a high-frequency radio apparatus is provided. The antenna device is connected to both a ground pattern and a feeding point formed on a circuit substrate. The antenna device comprises a metal, L-shaped antenna element, one end of which is connected to the ground pattern; and a feeding line, one end of which is connected to the feeding point and the other end of which is connected to a selected position on the antenna element so as to give the antenna device a predetermined value of impedance.
In another aspect, an orthogonal projection of the antenna element onto the plane defined in part by the ground pattern is included within the area of the ground pattern.
In another aspect, the area of orthogonal projection of the antenna element onto the plane defined in part by the ground pattern is smaller than the area of the ground pattern.
In another aspect, the antenna element is shaped into a lead wire.
In another aspect, the antenna device further comprises a dielectric member provided in the vicinity of the antenna element so as to set a resonance frequency of the antenna device to a predetermined value.
In another aspect, the dielectric member also functions to secure a display device, a circuit substrate, and a battery of the high-frequency radio apparatus.
In another aspect, a length of the antenna element is one fourth of the wavelength of the frequency to be used.
According to another aspect of the invention, a high-frequency radio apparatus is provided which comprises an antenna device for the high-frequency radio apparatus. The antenna devices comprises a ground pattern; a feeding point; a metal, L-shaped antenna element, one end of which is connected to the ground pattern; and a feeding line, one end of which is connected to the feeding point and the other end of which is connected to a selected position on the antenna element so as to give the antenna device a predetermined value of impedance; wherein the antenna device is connected to both the ground pattern and the feeding point formed on a circuit substrate. The high-frequency radio apparatus further comprises a plurality of electrical circuits mounted on the circuit substrate; and a display device for displaying information, the display device being positioned one side of the circuit substrate; wherein the antenna device is positioned on the same side of the circuit substrate as the display device.
In another aspect, the high-frequency radio apparatus further comprises a case which comprises a case body containing the antenna device, the display device, and the circuit substrate; and a case back made of conductive material. the high-frequency radio apparatus further comprises a battery having a plurality of electrodes for supplying power to drive the high-frequency radio apparatus; wherein the case back is electrically connected to either a ground pattern of the circuit substrate or the electrode of the battery.
According to another aspect of the invention, an antenna device for a high-frequency radio apparatus is provided. The antenna device is connected to both a ground pattern and a feeding point defined by an area formed on at least one layer of a multi-layer circuit substrate. The antenna device comprises a metal, L-shaped antenna element, one end of which is connected to the ground pattern; and a feeding line, one end of which is connected to the feeding point and the other end of which is connected to a selected position on the antenna element so as to give the antenna device a predetermined value of impedance.
In another aspect, an orthogonal projection of the antenna element onto the plane defined in part by the ground pattern is included within the area of the ground pattern.
In another aspect, the area of orthogonal projection of the antenna element onto the plane defined in part by the ground pattern is smaller than the area of the ground pattern.
In another aspect, the antenna element is shaped into a lead wire.
In another aspect, the antenna device further comprises a dielectric member provided in the vicinity of the antenna element so as to set a resonance frequency of the antenna device to a predetermined value.
In another aspect, the dielectric member also functions to secure a display device, a circuit substrate, and a battery of the high-frequency radio apparatus.
In another aspect, a length of the antenna element is one fourth of the wavelength of the frequency to be used.
According to another aspect of the invention, a high-frequency radio apparatus is provided which comprises an antenna device for a high-frequency radio apparatus. The antenna devices comprises a ground pattern; a feeding point; a metal, L-shaped antenna element, one end of which is connected to the ground pattern; and a feeding line, one end of which is connected to the feeding point and the other end of which is connected to a selected position on the antenna element so as to give the antenna device a predetermined value of impedance; wherein the antenna device is connected to both the ground pattern and the feeding point defined by an area formed on at least one layer of a multi-layer circuit substrate. The high-frequency radio apparatus further comprises a plurality of electrical circuits mounted on the circuit substrate; and a display device for displaying information, the display device being positioned on one side of the circuit substrate; wherein the antenna device is positioned on the same side of the circuit substrate as the display device.
In another aspect, the high-frequency radio apparatus further comprises a case comprising a case body containing the antenna device, the display device; and the circuit substrate; and a case back, made of conductive material. The high-frequency radio apparatus further compris
Dinh Trinh Vo
Seiko Epson Corporation
Wong Don
LandOfFree
Antenna device for high-frequency radio apparatus,... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Antenna device for high-frequency radio apparatus,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antenna device for high-frequency radio apparatus,... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3041018